Improvement in dust-bings tor watches



@uiten gratas sient @ffice Letters Potent No. 75.018, dated M'arci 3, 1868.

IMPROVEMENT IN DUST-RINGS 'FOR WATGHES.

' litige rlgcmle nimm tu in tigen hitters mail :un making gint at the snm.

Be it known that I, EDWARD HOWARD, oi' Boston` in the county of, Suffolk, and State of Miissn'chu'setzs, have invented a new anduseful Improvement in the Mode of' Securing thc Dust-Ringiso called) of Watches in place, of which the following is a full, clear, and exact description, reference being had tothe accompanying drawings, making a pnrt of this specification, in which- Figure l represents a top or plan view of thedust-ringpf u'watch.

Figure 2`is a sectionl of the same.

Figure 3 is an elevation ofthe watch-plates; and' Figure 1 is a. plan or top view of the same.

The object of. my invontionfis to secure the dust-ring of o watchin its' place in such a manner as to admit ofits being easily detached and again attached when necessary, while at the saine' time it forms :1 dust-tight joint around the works; and the invention consists in forming the lower 'ritn ofthe dust-ring with o snap edge nil :trouurl,fn-hich engages or fits vi'nto a corresponding reccssor 'groore formed. in the edge of the diallplat-e.

It is connnouvto arrange a-tlnst-ring within a watch so as to surround theworks and prevent the dust from entering, ns it is apt to do, between the joints of the-case.. "Thcse'.rings'hareg'eneIally hen fastened -by mea-ns of screws, which render their removal, when the watch is' to be taken .apart for repairs; somewhat ditiiculr.

They have also been fastened by means of springs, which add totheir cxpense, and do not u xake so tightajoint as by my invention. y

'Referring to the drawings, a, in the several figures, represents a dust-ring formed with a berellcd edge on the inside of the lower portion, us shown at a', fig. '2.' b represents the diul-plate upon which the dustjring is fitted. Its edge is also formed with a hevel or under cut" .corrcspnndiirgirith that of the inner side, a', of tha dust-ring, so thorns the lsnid ring is pressed down upon the 1lial-plnte, it snaps over in a manner similar to the cover of a watch-case, thus forming #perfectly-fitting and dust-tightjoint. When it is required tore'more the dust-ring for. any purpose, it is only necessary to press up..the edge-of the .same in a .manncrsiuiilar to that employ-'cd in 'opening the corcr of thc watchca'se, one or more curredrccesses being cut away at the joint 'or any portion ofthe rim for thenppiicazion oi' the thumb-nail, thus requiring no tools .or either attaching or removing the ring'. e, in iig. 4, represents a. pin or projection on the lower plate, which is designed to [it within a notch or cu-t in the lower edge of the dust-ring, to serv'ojas agende indittingtue latter in place.

What if claim as my invention, nud desire to secure by Letters Patent, is-

'YI hevt-l or snap edge on Suid plate,lengaging with a corresponding edge in the dust-ring, substantially as und for the purpose set forth.

In testimony whereof, Ihawe signed my nume to this specification in the presence of two subscribing witnesses.

4EDWARD HOWARD.v

Witnesses:

J. H. ADAMS', M. S. G. WILBE.

nc`mcvthod of attaching the dustfring' a to the lower pr dial'plate of a \\atch-movement, by means of'zr 

